Machine for turning crank pins of crank shafts



May 22, 1923. 1,456,02

K. F. MARX MACHINE FOR TURNING CRANK PINS OF CRANK SHAFTS Filed Nov. 22 1920 5 Sheets-Sheet l l/VVE/VTOR.

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May 22, 1923. 1,456,028

K. F. MARX MACHINE FOR TURNING CRANK PINS OF CRANK SHAFTS Fiied Nov. 22 1920 3 Sheets-Sheet 2 m I- a .H H. Z 0 llL I Z 3 2 6 1 11 24 ll! EIHIJH I IHIME ll INVENTOR. Ufa/dim 91W.

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' May 22;, 1923.

K. F. MARX MACHINE FOR TURNING CRANK PINS OF CRANK SHAFTS Filed Nov. 22 1920 v '3 Sheets-Sheet 3 1 T11 )RNEY.

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Application filed November 22, 1920. Serial No. 425,870.

To all whom it may concern:

Be it known that I, KARL, FREDERICK a citizen of the United States, residing at 4726 Belvidere Ave, Detroit, in the county of Wayne and State of Michigan,

have invented a new and useful Machine for Turning Crank Pins of Crank Shafts, of

which the following is a specification.

My invention relates to a new machine in which a multiple throw crankshaft to be machined by tools of tool carrying crank shafts, having the same length of stroke as the former, so that all of said crankshafts run in parallelism, and the object of my invention is, to provide a machine for turning all crank pins of a multiple throw crank shaft at the same time by revolving said crankshaft around its main axis and not as in the old way around its crank pin axes,

thereby saving considerable time in machining and cost of o ration. I attain the above and other ob ects by'the mechanism illustrated in the accompanying drawings, in which- Fig. 1 is a vertical section. of the entire machlne on the line 1-1 Fig. 2.

Fig. 2 a plan of the machine, and Fi 3 a vertical section of a part of the machine on line 3-3 Fig. 2, as it appears so after the removal of the tool holders.

frame, constitute the framework of the machine. Slidable on ways of the frame 3 is a carriage 4 operated by feed screw 5 and hand wheel 28. In the carriage 4 rotates a multiple throw crankshaft 6 aroundits main axis 21, said. crank shaft being held in alignment by chucks 81 and 39, and driven by ars 12. Idlers 13 driven by main drive pinion 14 on a drive shaft 29, form a connectlon between gears 12 and gears 15, the

latter driving one of the tool carrying crankshafts 8, and in turn, being connected by idlers 16 on a shaft. 18, with, gears 17 driving the other tool carrying crank shaft 9.

As all three are 12, 15 and 17 have the same number 0 teeth, all crankshafts will rotate in the same direction in parallelism to each other around their respective axes 12, 22 and 37, provided they are secured to 5 sand gears parallel to each other. By this arrangement it is possible to keep cutting tools 19 and 20, which are inserted in angula'r tool holders 10 and 11 carried by bearings 32, 33, 34 and 35 on the crank shafts 8 and 9, in proper relation to the crank shaft 6. As the tool carrying crank shafts are rotatable in bearings 38 of a housing 7 best shown in Fig. 3, it is possible to tllt said housing 7 about an axis 22 by means of a swivel nut 30, cross feed screw 23'operated by hand wheel 27, and bevel gp'ars 24, 25 and 26 held by swinging brac et 40, and

stationary bracket 36, thereby causing the tools 19 and 20 to approach or deviate from the crank pins to be machined as the operator sees fit. hand operated, means for automatic operation can be incorporated in the lateral and longitudinal feed mechanism of the machine. 7

I am aware that prior to my invention, c'rank in turning lathes have been made. with t e crankshaft revolving around the Of course instead of being axis of the crank pin to be turned, whereas,

in 'my invention, the crankshaft revolves around its main axis, therefore I claim:

1. In ametal working machine, means for causing a piece of work to move in a circumferential path, a tool, an angular tool holder having a short arm and a long arm with the tool at the juncture of said arms, and means engaging an end of each armof said angular tool holder for maintaining said holder vertical and for causing said tool in its, holder to travel in a circumferential path having an eccentric relation to the first mentioned path so that the tool may constantly operate upon the piece of work.

2. A machine of the type described comprising a tiltable housing, means for tilting said housing, crank shafts journalled in that said tools may operate on said crank shaft, and means adapted for bodily tilting the first mentioned crank shafts.

4. A machine of the type described com- 5 prising upper and lower crank shafts, an-

gular tool holders on said crank shafts,'tools carried by said tool holders, and means for raeaoee supporting a third crank shaft in the horizontal plane of the upper crank shaft for operation in synchronism with said upper and lower crank shafts so that said tools may operate on said third crank shaft.

KARL FREDERICK MARX. 

